Process for producing transparent, flexible, and infusible insulating means.



MED s'r as PAT KASPAR WINKLER, OF ZURICH, SWITZERLAND.

rnoonss non rnonncme mansrannnr, FLEXIBLE, AND mrosrnnn mstmarme MEANS.

Specification of Letters Patent. Application filed November 16, 1908. Serial No. 462,917.

No Drawing.

Tatented Mar. 1, 1910.

To all whom it may concern; I

Be it known that I, KAsPAn WINKLER, a subject of Austria-Hungary, residing at. Zurich, in the Canton of Zurich, Re ublic of Switzerland, (Whose post-oilice adc ress is 1 Malzstrasse, Zurich TIL) have invented certain new and useful Improvements in Processes for Producin Transparent, Flexible, and Infusible Insu ating Means; and I do hereby declare the following to be a full, clear, and exact description of the invention,- such as will enable others skilled in the art to which it appertains to make and use the same.

Hitherto drying vegetable oils have been used to produce a protecting film upon metallic articles by a continued heating. In these processes, a thickening of the oil takes place after some time in consequence of the oxidizing action of'thc air, either at ordinary temperatures or upon an artificially increased heating, and this thickening may increase until the oil becomes a solid.

The particular object of the present process is to transform also the scarcely oxidizable animalfats, especially fat train-oils and liquid waxes, and to coat incombustible materials, e. 9., asbestos, with such fats mixed with other agents. This is preferably done by suddenly raising their temperature in an air bath; or by means of a direct oxidizing flame, in such manner, that a transparent, elastic non-adhesive, insulating, film of high heat durability is produced.

In order to favor the taking up of oxygen and, thereby, the process of stiffening in these fats, the products of distillation of colophon in uantities of 30 to 90 per cent. are adde to t e said fats. Finally a siccative or a siccative oil is preferably used to hasten the drying.

As an example, we may take 50 gr. cod liver oil, gr. pinolin and 5 gr; resinate of Y manganese, and heat the same in a wide flat vessel in the opcnair by means of a suitable heating device, until the temperature is raised to about 275 .C. This resinate of manganese is composed of 100 parts of colophony, 10 parts of caustic soda (NaOI-I') and 35 parts of crystallized sodium carbonate (Na CO 101E1 0, whichronstituents are i boiled'in a kettle with 1,000 parts of water until the colophony hasbeen dissolved. To

the solution of resin-soap thus obtained. a solution of sulfate of manganese (MnSOQ is added in a sufficient quantity to decompose all the resin soap. The precipitate thus formed consists of the resinate of manganese employed. Instead of colophony, of course, other resins may be used. The pinolin employed is also called spirit of resin, and is a product of the dry distillation of colophony. The latter is heated in a still provided with a cooling means and a receptacle,

in order that the products may not be over heated. During the process the first runnings consist of an acid aqueous liquid up to about 130 degrees 0.. then comes pinolin from 130 degrees to 200.degrces C., after which come resin oils from 200 degrees C. upward. In the present process, the substances assing over between 150 degrees C. to 170 egrecs G. are preferably employed. This pinolin is. therefore, a mixture of resin distillates boiling-at about 150 (3.; and, after the mass is sufficiently heated it is left to cool down and this process is repeated several times, if necessary, until the cooked product has assumed a honey-like, strong, liquid consistency.

The product when ready to spread may be applied at 150 (3. in an equally thin layer upon the previously heated article, for example, copper wire; or' the article to be msulated may be plunged into the cookingproduct and at once brought into an air bath at 450 C. in whichvit may remain as long as the oil layer curdles and after a little cooling does not feel adhesive to the touch.

This insulating film possesses a very high elasticity, endures temperatures up to 600 (1., and above, without losing its transparency; is not soluble in strong acids, in strong corroding and caustic alkalies, nor in any of the carbureted'hydrogcns,1ncluding pyridin. T he new film has ln h fire and weather proof qualities, is-an excdllent insulator, is not fusible, and cannot be easily scratched.

This insulating material is preferably used in the protection of electric connecting wires and cables; and for covering metals 1n general with a protecting film when an in- ,sulator for heat and cold is desired. It may 1. The herein described process of producing insulating compounds, which consists in heating with a suitable siccatlve a mixture a transparentand insulating material is proof animal fat and a resinous compound until duced; substantially as described.

2. The process of producing an insulating covering which consists in heating With a drying agent a mixture consisting of animal fats and a resinous compound; in heating the articles to be coated, and then suitably applying said mixture to said articles; substantially as described.

3. The )rocess of producing an insulating covering tor metallic objects which consists in heating to substantially 27 5 C. a mixture of animal fats, resinous distillates, and a mixture at a suitable temperature in a thin layerto said objects; substantially as described.

In'testiinony whereof, I have signed my name to this specification in the presence of 20 two subscribing witnesses.

I KASPAR WIN KLER. I Vitnesses JOSEPH SIMS, I-IERMANN HUBER.

drying agent; and in then applying said 5 

